16 + DC for me, no immediate plans to add any others to the list at the moment although I do plan to return to several of these over the next 2 years.

Visited:
Minnesota
North Dakota
South Dakota
Illinois
California
Hawaii
Arizona
New York
Florida
Virginia
North Carolina
New Jersey
Texas
D.C.

Passed Through/Pit Stop:
Maryland (drove through en route from Virginia to DC)
Colorado (connected a few times and overnighted once at Denver Airport)
Wisconsin (drove through en route from Minnesota to Illinois)

I'm from Canada and I was born and grew up a city called Sarnia, Ontario, just across the border from Port Huron, Michigan. my family always shop in Michigan many times over the years. I have been to about 15 states so far.